Dental pliers.



S. J. SYMMONS.

DENTAL PLIERS.

APPLICATION FILED AUG-10.1916.

1 36,511. Patented Feb. 20, 1917.

UNTE

SAMUEL J. SYMMONS. OF OAKLAND, CALIFORNIA.

DENTAL PLIEBS.

Application filed August 10, 1916.

To all whom it may concern:

Be it known that I, SAMUEL JAMns SYM- MoNs, a citizen of the UnitedStates, residing at 423 Central Bank Building, Oakland, in the county ofAlameda and State of California, have invented certain new and usefulImprovements in Dental Pliers, of which the following is aspecification.

This invention relates to dentistry and particularly to pliers, the saidinvention being primarily of utility in connection with the removal ofcrowns without damaging the said crowns.

The primary purpose of the invention is to provide device by which thecrown may be loosened and removed without its distortion, thus enablingan operator to replace the crown after treatment of the tooth andparticularly after attaching bridgework to the crown. According topractice now commonly followed, diliiculty has been experienced ininstalling bridgework and where the abutment orjsupport of thebridgework constituted a crown, it has been necessary to split the crownto efiect its removal, thus making it necessary to make a wholly newcrown with the bridgework attached.

By the use of the present invention, the crown is loosened and removedand bridgework may then be secured to it and the crown may then berestored as it was placed in the first instance, resulting in verymaterial saving as compared with the old method.

A further object of the invention, therefore, is to provide novel meanswhereby the crown may be held while it is rolled or manipulated todisintegrate or break the ocment by which it is anchored, the said crownbeing then gripped and removed without inury.

With the foregoing and other objects in view, the invention consists inthe details of construction, and in the arrangement and combination ofparts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to theaccompanying Specification of Letters Patent.

Patented Feb. 20, 1917,

Serial No. 114,160.

drawings forming part of this specification wherein like charactersdenote corresponding parts in the several views and in which- Figure 1illustrates a view in elevation of a dental tool embodying theinvention;

Fig. 2 illustrates a sectional view through the rollers on a shank, thesaid shank being in elevation;

Fig. 3 illustrates an end view of one of the rollers;

Fig. 4 illustrates an end view of a jaw adapted to coact with therollers;

Fig. 5 illustrates a sectional view of a shank with the roller coactingelement applied thereto; and i Fig. 6 illustrates a slight modificationwith respect to the shape of the shanks of the tool. 7.

In these drawings 7 denotesa plier like structure in which there are twohandles pivoted together for operating shanks 8 and 9 to bring themcloser together or to move them apart and as the construction of thehandle and the means by which they communicate motion to the'shanks isimmaterial as to detail they are not specifically illustrated ordescribed, it being understood that any appropriate means may besupplied for accomplishing the result stated. The shank 8 has a spindle10 projecting from its end and rollers 11 are mounted to rota-teen thesaid spindle, said rollers being held in place by a nut 12.

The shank 9 has a threaded extension 18 on which a jaw 14 is mounted,the said jaw being provided with threads 15 to engage the threads of theextension 13 and the said jaw is further provided with a threadedaperture 16 to receive the set screw 17 by which the jaw is held atdifferent positions of adjustment. The jaw 14 has a recess or cavity 18which, in outline, approximates the contour of a tooth so that when thejaw is applied to the crown of the tooth, frictional contact is insuredwhich will prevent slipping, under certain conditions, as when the crownis to be taken 01?, but the wall of the cavity is smooth so that it mayslide on the crown as when-the instrument is turned on the crown-teifect disintegration'of the cement which holds the crown in place. 7

It has been found in practicethat when the instrument is applied to acrown and gently'rotated'or twisted, the rollers per- :form an actionakin'to kneading, the pressure being slight but suflicient todisintegrate or crush the cement for the purpose stated. 7. V

In Fig. 6, the shankA is of the same construction and handles areprovided for opf erating the shanks as'heretofore described,

the modification consisting in having the spindle '13 set at'an anglewith relation to thejshank, it being understood that the .ex-.

tension of the modification which correfor the purpose intended. It hasalso been found desirable in practice to have a plier provided withspindles and extensions which stand at an angle with relation to theshanks V opposite to the angle at which the spindle in Fig. 6 extends,as by this last mentioned .modifica'tion the instrument is of greaterutility in connection with the back of molar teeth. on the opposite sideof the mouth. In other words, the instrument is of greater utility whenmade in what may be termed right hand and left hand construction,meaning thereby for use on the right hand side and .on the left handside of the mouth,

whereas the instrument shown in Fig. 1 will be of special utility inconnection with use on crowns intermediately positioned.

While the form of invention herein shown and described is what isbelieved to be the preferable embodiment thereof, it is nevertheless tobe understood that minor changes may be made in the form, proportion anddetails of the construction without departing from the spirit and scopeof the invention as hereinafter claimed.

What is claimed as new is 1. In a dental instrument, shanks having meansfor their manipulation, a spindle on one of the shanks, rollers mountedto rotate on the said shank, a threaded extension on the opposite shank,a jaw having a cavity or recess adapted to coact with the rollers, andmeans for holding the jaw at different positions of adjustment.

2. In a dental instrument, shanks having means for their manipulation, aspindle on one of the shanks, rollers mounted to rotate on the saidspindle, an extension on the opposite shank, a jaw having a cavity orrecess adapted to coact with the rollers, and means for holding the jawat different positions of adjustment.

3. In a dental instrument, shanks having means for their manipulation, aspindle extending at an angle to the shank, rollers mounted on the saidspindle, an extension standing at an angle to the opposite shank,

and a jaw adjustably secured on said extension.

In testimony whereof I affix my signature in the presence of twowitnesses.

SAMUEL J. SYMMONS.

.Witnesses:

J. A. TREMBLE, I. S; RANKIN;

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

